Thanks for the responses guys, we would be gone for just short of a week. Since we have had the oldest cats about 6 years now we have always gave them a mixture of wet and dry food and feeding times have sort of fell into the pattern of breakfast, lunch, and dinner over the years.
They actually don't seem to overeat on their own cause there is always a little dry food left over and sometimes even wet food after a meal. But we have never really left for a long period of time and I can really only think of a few occasions where they have missed a lunch maybe or held off a breakfast until lunch.
So I am just not sure what to expect.. hopefully everything will be fine and I think it will, they are all very well behaved and mellow cats and I will see if we can work out a morning and night deal cause that does sound better than once a day.
Any more opinions/experiance/questions are more than welcome.